I posted this to the ccie list as well. I'm hoping someone has run across this before.
I'll start with the original scenario that worked so I can show you where I began before I show you what I'm trying to accomplish now. There are three relevant routers here: A----(ospf)----B----(rip)-----C A originates a default route to B and I use default-information originate in the RIP config to pass 0.0.0.0/0 to C. This works well. Then I took RIP away and tried this with IGRP and ip default-network. This took some tweaking before I could get B to originate default route to C with IGRP. Is it just me or did Cisco seem to make this very user-unfriendly?? Unbelievable. This is *so* easy with other protocols. Anyway... In the first scenario, B has a single gateway of last resort: 0.0.0.0/0 via router A. Beautiful. In the second scenario I end up with two candidate GOLRs but neither is picked and routing breaks! This makes *zero* sense to me. If ip classless is configured and still have 0.0.0.0/0 in my routing table then B should route all packets with unknown destinations to A, right?? Well, it's not working and I can consistently recreate it. If I remove the ip default-network statement routing works but then C has no default route. What could be wrong here? For grins, I'll paste in some command output to show you what I mean. R4 is "Router B" in the above scenario. Gateway of last resort is 152.1.3.2 to network 0.0.0.0 152.1.0.0/16 is variably subnetted, 2 subnets, 2 masks O IA 152.1.1.0/25 [110/74] via 152.1.3.2, 05:19:53, Serial0 C 152.1.3.0/30 is directly connected, Serial0 130.1.0.0/16 is variably subnetted, 9 subnets, 2 masks I 130.1.3.0/24 [100/1188] via 130.1.4.2, 00:00:28, TokenRing0 I 130.1.2.0/24 [100/1188] via 130.1.4.2, 00:00:28, TokenRing0 I 130.1.1.0/24 [100/1188] via 130.1.4.2, 00:00:28, TokenRing0 O 130.1.0.0/22 is a summary, 05:19:54, Null0 I 130.1.7.0/24 [100/1188] via 130.1.4.2, 00:00:29, TokenRing0 I 130.1.6.0/24 [100/1188] via 130.1.4.2, 00:00:29, TokenRing0 I 130.1.5.0/24 [100/1188] via 130.1.4.2, 00:00:29, TokenRing0 O 130.1.4.0/22 is a summary, 05:19:54, Null0 C 130.1.4.0/24 is directly connected, TokenRing0 C 30.0.0.0/8 is directly connected, Loopback1 O*N2 0.0.0.0/0 [110/1] via 152.1.3.2, 05:19:56, Serial0 R4#ping 20.1.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 24/28/40 ms R4# After I add ip default-network 30.0.0.0: Gateway of last resort is not set 152.1.0.0/16 is variably subnetted, 2 subnets, 2 masks O IA 152.1.1.0/25 [110/74] via 152.1.3.2, 05:21:19, Serial0 C 152.1.3.0/30 is directly connected, Serial0 130.1.0.0/16 is variably subnetted, 9 subnets, 2 masks I 130.1.3.0/24 [100/1188] via 130.1.4.2, 00:00:32, TokenRing0 I 130.1.2.0/24 [100/1188] via 130.1.4.2, 00:00:32, TokenRing0 I 130.1.1.0/24 [100/1188] via 130.1.4.2, 00:00:32, TokenRing0 O 130.1.0.0/22 is a summary, 05:21:19, Null0 I 130.1.7.0/24 [100/1188] via 130.1.4.2, 00:00:34, TokenRing0 I 130.1.6.0/24 [100/1188] via 130.1.4.2, 00:00:34, TokenRing0 I 130.1.5.0/24 [100/1188] via 130.1.4.2, 00:00:34, TokenRing0 O 130.1.4.0/22 is a summary, 05:21:20, Null0 C 130.1.4.0/24 is directly connected, TokenRing0 C* 30.0.0.0/8 is directly connected, Loopback1 O*N2 0.0.0.0/0 [110/1] via 152.1.3.2, 05:21:22, Serial0 R4# R4#ping 20.1.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds: ..... Success rate is 0 percent (0/5) R4# Any help would be appreciated. I'm about to swear off using IGRP and EIGRP for the rest of my life just on principle. :-) Thanks, John _______________________________________________________ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=25216&t=25216 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
